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Shutter device

a technology of shutter blades and yoke, which is applied in the direction of shutters, television systems, instruments, etc., can solve the problems of affecting the accuracy of shutter blade operation, and affecting the speed of shutter blade travel

Inactive Publication Date: 2012-05-24
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]According to an exemplary embodiment of the present invention, a shutter device can be provided that is capable of preventing the speed of travel of shutter blades from varying without damaging attraction surfaces of a yoke and an armature.

Problems solved by technology

If the blade lever collides with the drive lever in this state, attraction surfaces of the yoke and the armature may be damaged.
If the attraction surfaces of the yoke and the armature are damaged, the attracting performance and the separation performance may degrade.
As a result, the accuracy of the operation of the shutter device may degrade.
In this case, however, the pivot speed of the drive lever may vary due to the impact from the collision.
In this case also, the accuracy of the operation of the shutter device may degrade.

Method used

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Embodiment Construction

[0033]Various exemplary embodiments, features, and aspects of the invention will be described in detail below with reference to the drawings.

[0034]Now, a shutter device, which implements the present invention, and an imaging apparatus equipped with the shutter device, will be described in detail below with reference to FIGS. 1A, 1B, and 20.

[0035]FIG. 20 is a central-plane cross section of a digital single-lens reflex camera body 101, which is an imaging apparatus according to an exemplary embodiment of the present invention, and an interchangeable lens 201.

[0036]The interchangeable lens 201, which can be detachably attached to the camera body 101, is fixed by a camera mounting portion 102 and a lens mounting portion 202. When the interchangeable lens 201 is mounted, the contact portion 103 of the camera body 101 and the contact portion 203 of the interchangeable lens 201 are electrically connected with each other. At this timing, the camera body 101 detects that the interchangeable ...

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PUM

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Abstract

When a blade drive spring has been overcharged when a second cam gear has caused a drive lever to move to a position beyond a position of attraction of an armature by a yoke, a blade lever does not contact the drive lever even if the blade lever has been driven in a direction of opening an aperture by a first blade and a second blade with an urging force of a blade return spring. When the second cam gear has moved to the attraction position form the overcharged position, the blade lever contacts the drive lever before the yoke starts attracting the armature by the attractive force.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a shutter device.[0003]2. Description of the Related Art[0004]Japanese Patent Application Laid-Open No. 2008-180815 discusses an imaging apparatus that uses a focal plane shutter and an electronic shutter in combination with each other to execute an imaging operation. The conventional imaging apparatus starts an exposure operation by using an electronic shutter function of an image sensor. In addition, the conventional imaging apparatus controls a blade group constituted by a mechanical shutter to end an exposure operation.[0005]In the above-described conventional imaging apparatus, after locking a drive lever by energizing an electromagnet, a set lever starts driving a mirror in a mirror-up direction. After the mirror-up operation, a blade lever is unlocked and an aperture formed by a blade group is opened. Subsequently, when the energization of the electromagnet is discontinued at a pr...

Claims

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Application Information

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IPC IPC(8): G03B9/10
CPCG03B9/42H04N5/353H04N5/2353G03B19/12H04N23/73H04N25/53
Inventor NISHIO, TETSUYAIMAI, RENTARO
Owner CANON KK